Coating and lubricating composition



Patented Dec. 29, 1953 'J 1 Arnold" F. Kluender; Chicago Heights, 111., as-

signor to Mor-Film Company; a corporation of Illinois N Drawing. Application August 25,1949 Serial/No. 112,416

The present invention relates", generally; to new and useful-improvements in coating, compositions adapted to be dispersed'in water andthen applied to the surfaces of metal stock or other metal pieces so as to provide, when dry, an adherent protective film having desirable rustproofing properties, and which also serves as a surface lubricant when the metal stock or piece is worked under pressure.

There is a large number of manufacturers and fabricators who purchase and maintain an inventory of metal stock such as sheets, bars and rods, which they use from time to time in manufactur ing and fabricating operations. After being. delivered and umoaded, a considerableperiod of time may elapse before such metal stock is utilized, and during this period the surface of the stock requires protection even though stored un-- der cover. If the metal stock is not protected, it

usually has to be cleaned prior to use, andv such.

cleaning is undesirable in that it requires. time and adds to costs of production.

According to the present invention, new and improved coating compositions are provided which may easily be dispersed in water and then used for coating such metal stock so as toform' upon drying a protective film on the surface of the metal stock. The protective: coating or film remains on the metal stock and serves the dual purpose of alubricating film when the. metal stock is subjected to working and drawing operations such as drawing, stamping, shaping, etc. Desirably, the coating compositions may contain one or more addition components inminor amounts which contribute beneficial properties to the protective films, such as substantial rustproofing properties.

The object ofmy invention, generally stated, is the provision of a composition of matter, usually in dry form, which may readily be dispersed in water so as to provide a composition for coating metal stock which upon drying leaves an adherent film which protects the metal stock dur: ing storage and which affords lubrication during working under high pressures.

Animportant object of the invention is the provision ofa new composition which is comparatively inexpensive and easily packaged, stored and handled in granular form which, upon being dispersed in water, provides a coating composition for metal stock such as bar and rod stock, sheet, etc;, said coating upon drying providing the: stock with an adherent protective film which pro vides for lubrication when the metal stock is: worked under high pressures and stress: as in deepdrawingoperations;

Still another object of the inventionis the pro-- vision of a coating composition in dry granular form, which may readily be dispersed in water and applied to metal stock in that form, so as to provideupon drying a protective film which has lubricating properties in working operations such as deep drawing, said composition also including.

For a more complete understanding of thenature and scope of the invention, reference may now be had to the following detailed description thereof wherein certain presently preferred embodimentsof the invention are set forth in the examplesby way of illustration.

The coating compositions of the present invention consist essentially of 20 to 30 parts by weight of water-soluble, medium titre soap (or the equivalent constituent components) having a titre value of from 22 to 30 and from about The values of 70" to 80 parts by weight of borax. to 80 parts by weight for the borax constituent are based on sodium tetraborate containing 10 molecules of water of crystallization or hydration. If desired, sodium tetraborate which is anhydrous or 'contains'less than 10 molecules of water of hydration'may be used, in which case therange of will be correspondinglyreduced; For example, when anhydrous sodium- 70 to 80 parts by weight tetraborate is used, the range in parts by weight will. be from. 37 to. 42 instead or" from 70 to 80.

The preferred embodiments of the invention contain as a third ingredient a small portion of trisodium phosphate, sodium nitrite, or soda ash.

These ingredients contribute rustproofing properties to the films coated onto the metal stock, and,

in addition, have high temperature lubricating propertieswhen the metal stock is worked as by deep drawing. When such a third ingredient is included-in the compositions they'will consist es sentially of 20 to 30 parts by weight of the watersoluble, medium titre soap, about 65 to parts by weight of. the bora'x and parts by weight of trisodium phosphate, sodium nitrite, or soda ash. The values of 2 to 5 parts byweight are, as in the case of the borax, based on ingredients containing water of hydration,

and when corresponding anhydrous ingredientsare employed, these values will be reduced.

In certain embodiments of the invention I may also include from 2 to 5 parts by weight of starch;

which improves the properties of the protective.-

films' in regard to improved adherence under unusually; humid or. moist storage conditions.

approximately 2 to 5 The formulations set forth in the following examples more fully illustrate the nature of the invention and the preferred methods of practicing it:

Example 1 Parts by weight #718 Armour certified flake soap 1 25 Borax, granulated 70 'Tri-sodium phosphate 5 Medium titre sodium soap of red oil having titre of 28-32 0.

Parts by weight Sodium soap of cottonseed oil (titre 28-32) 25 "Borax, granulated 70 Tri-sodium phosphate 2 Example 7 Parts by weight #718 Armour certified flake soap 25 NazfilO'z 33 Sodium nitrite 5 Starch 5 Example 8 Parts by weight #718 Armour certified flake soap 20 Borax, granulated 75 Starch 5 Medium titre soaps derived from other fatty acids such as corn oil and soya bean oil may also be used in the foregoing formulations to replace all or a part of the medium titre soap of red oil.

Each of the formulations given in the foregoing examples is in the form of a dry granular powder which may be prepared by admixing the ingredients together in the proper proportions. The compositions may be packaged according to standard packaging techniques in known types of packages such as cardboard cartons, barre1s or drums.

In use, the dry granular compositions are dispersed or dissolved in water in the ratio of about 1 part by weight of the dry formulation from 5 to 30 parts of water, although this ratio is not critical. Usually the coating solution will be made up in a dip tank or similar receptacle so that the metal stock to be coated may merely be immersed therein and then removed to dry on standing. It will, of course, be understood that the composition can be sprayed or otherwise applied directly to the metal stock.

In the foregoing examples, the medium titre soaps may be in whole, or in part, replaced by the constituent components in approximately the stoichiometric proportions for forming the soap. That is, instead of using a soap, the coating compositions may be formulated in dry form by admixing the alkali (e. g. caustic soda or caustic potash) and free fatty acid components of the soap in suitable proportions to react and form the soap. From the practical standpoint there may be advantages in using the soap-forming components instead of the soap itself. Thus, there are instances wherein it is cheaper to formulate the soap components of the composi tions directly from the alkali and the corresponding free fatty acid, rather than by formulating with the soap itself. Also, a greater degree of flexibility in formulation is possible in formulating with alkali and free fatty acid since there is a, much wider range of commercial free fatty acids available for use than the range of suitable medium titre soap-s which are commercially available.

The following examples will serve to illustrate embodiments of the invention formulated using alkali and free fatty acid instead of the medium titre soap:

Example 9 Parts by weight Caustic soda 3.2 Red oil (oleic acid) 21.8 Borax, granulated 70 Tri-sodium phosphate 5 The caustic soda, borax and tri-sodium phosphate are mixed in a suitable mechanical mixer and the red oil may then be sprayed onto the mass and uniformly blended therewith. The caustic soda and red oil will react sufficiently to produce a free-flowing product. The reaction between the alkali and fatty acid will be completed when the product is dissolved in water preparatory to use in coating metal. Heating will hasten the completionof the reaction.

Example 10 Parts by weight Caustic soda 2.5 Red oil (oleic acid) 17.5 Borax, granulated 75 Soda ash 2.5 Starch 2.5

Example 11 Parts by weight Caustic soda 3.8 Red oil (oleic acid) 26.2

,; Borax, granulated Tri-sodium phosphate 3 Soda ash 2 Example 12 Parts by weight .3

The fatty acid component in Examples 9-12 may be derived from cottonseed oil, corn oil or soya oil, or other fatty acids which will yield a medium titre soap.

In those formulations made with anhydrous constituents, it may be desirable to add water in an amount sufiicient to make up for all or a portion of that normally present as water of crystallization.

It will be apparent that a large number of formulations may be made in view of the foregoing disclosure, which will vary somewhat with respect to specific percentages and types of ingredients. In all instances, at least about 85% by weight of the formulations will consist together of Na Bioi, either hydrated or anhydrous, plus the medium titre soap, either as such or as the corresponding alkali and free fatty acid constituents in approximately stoichiornetric proportions. The balance of the formulations, if any, will consist essentially of at least one of the group, trisodium phosphate, sodium nitrite and soda ash, plus starch, if present.

Having fully described my invention and having set forth a number of the preferred embodiments thereof, what is claimed as new is:

1. A new composition of matter adapted to be dispersed in water and used to coat metal stock so as to form upon drying thereon an adherent protective film having rustproofing properties and which serves as a surface lubricant in working the metal stock, and consisting essentially of to 30 parts by weight of a soap material selected from the group consisting of water-soluble medium titre soap having a titre value of from 22 to 30 and the alkali and free fatty acid soapforming constituents of said soap, 34 to 40 parts by weight of Na2B4o7 calculated on an anhydrous basis, and approximately 2 to 5 parts by weight of at least one member selected from the group consisting of trisodium phosphate, sodium nitrite and soda ash.

2. A new composition of matter adapted to be dispersed in water and used to coat metal stock so as to form upon drying thereon an adherent protective film having rustproofing properties and which serves as a surface lubricant in working the metal stock, and consisting essentially of approximately 20 to 30 parts of a. soap material selected from the group consisting of water-soluble medium titre soap having a titre value of from about 22 to 30 and the alkali and free fatty acid soap-forming constituents of said soap, approximately 65 to 75 parts by weight of granulated borax, and approximately 2 to 5 parts by weight of trisodium phosphate.

3. The composition called for in claim 1 wherein said water-soluble medium titre soap is at least one of the group consisting of the sodium and potassium soaps of red oil having a titre within the range of 28-32 C,

4. The composition called for in claim 2 wherein said water-soluble medium titre soap is at least one of the group consisting of the sodium and potassium soaps of red oil having a titre within the range of 28-32 C.

5. The composition called for in claim 1 containing about 2 to 5 parts by weight of starch.

6. The composition called for in claim 2 containing about 2 to 5 parts by weight of starch.

7. A new composition of matter adapted to be dispersed in water and used to coat metal stock so as to form upon drying thereon an adherent protective film which serves as a surface lubricant in working the metal stock, and consisting essentially of from 20 to 30 parts by weight of a soap material selected from the group consisting of water-soluble medium titre soap having a titre valu of from 22 to 30 and the alkali and free fatty acid soap-forming constituents of said soap, and from about 37 to 42 parts by weight of NazB4O7 calculated on an anhydrous basis.

8. The composition called for in claim 7 wherein said water-soluble soap is at least one of the group consisting of the sodium and potassium soaps of red oil having a titre within the range of 28-32 C.

9. A new composition of matter adapted to be dispersed in water and used to coat metal stock so as to form upon drying thereon an adherent protective film which serves as a surface lubricant in working the metal stock, and consisting essentially of from 20 to 30 parts by weight of a soap material selected from the group consisting of water-soluble medium titre soap having a titre value of from 22 to 30 and the alkali and free fatty acid soap-forming constituents of said soap, and from about 70 to parts by weight of granulated borax.

10. The composition called for in claim 7 containing about 2 to 5 parts by weight of starch.

11. The composition called for in claim 8 containing about 2 to 5 parts by weight of starch.

12. A new composition of matter adapted to be dispersed in water and used to coat metal stock so as to form upon drying thereon an adherent protective film having rustproofing properties and which serves as a surface lubricant in working the metal stock, and consisting essentially of at least about by weight of a mixture of 20 to 30 parts by weight of a soap material selected from the group consisting of (1) water-soluble medium titre soap having a titre value of from 22 to 30 and (2) the alkali and free fatty acid soap-forming constituents of said soap, and 70 to 80 parts by Weight of borax.

13. A new composition of matter adapted to be dispersed in water and used to coat metal stock so as to form upon drying thereon an adherent protective film having rustproofing properties and which serves as a surface lubricant in working the metal stock, and consisting essentially of approximately 25 parts by weight of the sodium soap of red oil having a titre within the range of 28-32 C., approximately 70 parts by weight of granulated borax, and approximately 5 parts by weight of trisodium phosphate.

14. The composition of claim 13 wherein the soap is replaced by caustic soda and red oil in soap-forming proportions.

15. The composition of claim 12 wherein said soap is at least in part replaced by its alkali and free fatty acid constituents.

16. A new composition of matter adapted to be dispersed in water and used to coat metal stock so as to form upon drying thereon an adherent protective film which serves as a surface lubricant in working the metal stock, and consisting essentially of approximately 3.2 parts by weight of caustic soda, approximately 21.8 parts by weight of red oil, approximately 70 parts by weight of borax and approximately 5 parts by weight of trisodium phosphate.

ARNOLD F. KLUENDER.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date Re. 23,184 Whitbeck Dec. 20, 1949 2,074,224 Johnson Mar. 16, 1937 2,252,385 Orozco Aug. 12, 1941 2,469,473 Orozco May 10, 1949 2,530,837 Orozco Nov. 21, 1950 

1. A NEW COMPOSITION OF MATTER ADAPTED TO BE DISPERSED IN WATER AND USED TO COAT METAL STOCK SO AS TO FORM UPON DRYING THEREON AN ADHERENT PROTECTIVE FILM HAVING RUSTPROOFING PROPERTIES AND WHICH SERVES AS A SURFACE LUBRICANT IN WORKING THE METAL STOCK, AND CONSISTING ESSENTIALLY OF 20 TO 30 PARTS BY WEIGHT OF A SOAP MATERIAL SELECTED FROM THE GROUP CONSISTING OF WATER-SOLUBLE MEDIUM TITRE SOAP HAVING A TITRE VALUE OF FROM 22 TO 30 AND THE ALKALI AND FREE FATTY ACID SOAPFORMING CONSTITUENTS OF SAID SOAP, 34 TO 40 PARTS BY WEIGHT OF NA2B407 CALCULATED ON AN ANHYDROUS BASIS, AND APPROXIMATELY 2 TO 5 PARTS BY WEIGHT OF AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF TRISODIUM PHOSPHATE, SODIUM NITRITE AND SODA ASH. 